Safety appliance for elevators.



J. J. KUNTZ.

SAFETY APPLIANCE FOR ELEVATORS. APPLICATION FILED.JBLY9,19I4.

l 1 82, 9 l 4. Patent-ed May 16, 1916.

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M I'M'M @LAM WW JOHN J. KUNTZ, F BROIOKLYN, NEW YORK.

SAFETY APPLIANCE FOR ELEVATORS.

Specification of Letters Patent.

Application filed July 9,1914. Serial No. 850,049.

To all whom it may concern Be it known that I, JOHN J. KUNTZ, a citizenof the United States, residing at Brooklyn, in the county of Kings andState of New York, have invented certain new and useful Improvements inSafety Appliances for Elevators, of which the following is aautomatically break the circuit to the con-' troller when its door isopcned and will not close the circuit again until the door is fullyclosed and locked.

The invention will be first hereinafter described in connection withdrawings, which constitute a part of this specification, and then morespecifically de finedfin the claims at the end of the specification. i

In the accompanying drawings, wherein corresponding parts are indicatedby similar reference characters throughout the several views: Figure 1is a diagrammatic view of an elevator shaft with three doors, the middleone of which is open disclosing the controller and indicating thecircuit from a generator including my improved circuit breakers as Wellas the controller. Fig. 2 is an interior side view of one of my improvedcircuit breakers, and Fig. 3 is a cross section through Fig. 2 with thecircuit closer in open position.

In Fig. 1, A, A and A designate the doors to an elevator shaft 13, and Cindicates the controller on the'elevator which, as shown, is arrangedopposite the open door A. D, D and D designate my improved circuitbreakers applied to the frame of 5O.each of the doors. Each circuitbreaker has as to close the circuit when the door is closed and locked,but which automatically springs outward and breaks the circuit whenreleased by the unlocking and opening of the door. The circuit from thegenerator F is through conductor G which includes the the accompanyingonthe elevator arranged opposite said door,

of the partition from the spring,

a spring leaf E which is pressed inward so motor G breakers, byconductor H from this circuit breaker to the next one, by conductor Ifrom the second circuit breaker to a fixed point 0, by looped conductorJ from the fixed point e to the controller, by looped conductor from thecontroller to a fixed point 0, by conductor I from the point 0 to thethird circuit breaker, and by conductor K from the third circuit breakerback to the generator.

It will thus be of the doors is left unlocked, the correspondmg circuitbreaker will automatically interrupt the circuit to the controller andprevent the car from being moved until said door has been closed andlocked. stood that when the door is closed, it en- .gages the projectingspring leaf E and depresses'thesaine to close the circuit. If the door snot locked or screwed, however, the

resiliency of the leaf will force the door open again far enough tobreak the circuit. In other words, it is necessary to lock or secure thedoor in closed position in order to maintain a closed circuit.Consequently, all danger from accidents due to elevator doors being leftunlocked are effectually avoided.

eferring to Figs. 2 and 3, within the casing of each circuit breakerthere is a parto the top one of the circuit seen that when anyone Itwill be under-- Patented May to. 2i 5);! 6.

tition L to whichthe terminal contacts M,

M are secured in spaced relation. mediate of said contacts, thepartition is perforated, as at N. The spring leaf E is secured at oneend to the outer surface of the casing and is normally pressed outwardby a spring 0 coiled about a guide pin P which is secured to said leafnear its attachi end and extends through the wall of the .11 and alsothrough the? partition L, see The spring 0 abuts atone end against thepartition and at the other end against a nut Q which is adjustable onthe pin P for the purpose of varying the tension of the e spring. Thepin P is provided with a head R, or other obstruction on theoppositeside for limiting the outward movement of said pin and the leafE.

Attached to the leaf E near its free end is a guide pin S extending intothe casing and carrying at its inner end a bridging plate T normallyarranged opposite but out of contact with the terminals M and M. Thebridging plate is adapted to siide along the guide pin S against theinfluence lnterof a spring U for equalizing the pressure 0f said plateupon boih terminals when. the leaf E is pressed in. The spring 1. may becoiled about the pin so as to abut at one end against the plate forInirinally holding the same against the head V at ihe inner end of saidpin, While the other end of said spring abuts against a washer fixed toihe pin in any suitable inanimr.

As ind'iated in. dotted lines in 2 when the leaf if is pressed. in. thebridging plate '1. will firs'ii (101116 in contact Wiill the terminals Mand H and then be forcibly held With equal pressure against both of saidterminals by the contraction of the spring U as the eel reaches itsfully gressed in position. In ibis last stage of the moieniei'ilt of theleaf, the inner end ofthe pin if) is projected into the opening in thepa ration. The inner end of the in P is projected slightly beyond thepartition L zhe inward BHUYQ- nient of the leaf the spring 0 being thuscontracted and its tension conseipiently increased so that it willzmtonialically more the leaf outward again to break the circuit soon assaid leaf is released by the un locking of the door to the elevatorshaft.

Haring thus descr'bed my invention, What claim as new and desire tosecure by Lee ters Patent of the l lniied Stakes is:

l. A circuit breaker comprising a casing,

a partition therein, a pair of spaced ter1nina ls secured to said partiiion, a spring pressed leaf a guiding pin carried by said leaf. abridging plate mounted to slide along said pin, and resilient means foryieldingly holding said plate at the inner end of the pin, said platebeing adapted to engage the terminals before the leaf fully depressed,and said partition having a, recess between lhe rerniinals's forreceiving vthe end of the pin. when projected beyond the plate on thefull inward lllO's'PlllQlll} 0f the leaf.

2. A eireuit breaker comprising a using, a partition therein. a prir ofspaced terminals. a bridging plate carried by the leaf and adapled toengage said terminals when the leaf is depressed. a pin carried by theleaf and extending through the partition, 21 projer ion on the inner endoi? said pin for limiting the outward movement ol the had. an axiallyadjustable nut on said pin. and a spring; interposed between said nutand the partit on. for the purpose specified.

ll. testimony whereof I have signed my namein this specification in thepresence of two attesting witnesses.

JOHN J. KUNTZ.

Witnesses Hnxny J. lTiI'lfiiAG, E. S'rmnnax A err.

